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Blocked rotor test is conducted on an induction motor. It is also known as short circuit test or locked rotor test or stalled torque test.^[1] From this test short circuit current at normal voltage, power factor on short circuit, total leakage reactance, starting torque of the motor can be found.^[2]^[3] The test is conducted at low voltage because if the applied voltage was normal voltage then the current flowing through the stator windings were high enough to over heat the winding and damage them.^[4] The blocked rotor torque test is not performed on a wound rotor motors because the starting torque can be varied as desired. However, blocked rotor current test is conducted on squirrel cage rotor motors.^[5]

Method

In the blocked rotor test, the rotor is locked.^[6] A low voltage is applied on the stator terminals so that full load current flows in the stator winding. The current, voltage and power input are measured at this point. When the rotor is stationary the slip, $s = 1$ .^[7] The test is conducted at $1 / 4^{t h}$ the rated frequency as recommended by IEEE. This is because the rotor's effective resistance at low frequency may differ at high frequency.^[8]^[9] The test can be repeated for different values of voltage to ensure the values obtained are consistent. As the current flowing through the stator may exceed the rated current, the test should be conducted quickly.^[10] By using the parameters found by this test, the motor circle diagram can be constructed.^[11]

Calculations involved

Short circuit current at normal voltage

$I_{S}$ is the short circuit current at voltage $V_{S}$
$I_{S N}$ is the short circuit current at normal voltage $V$
$I_{S N} = I_{S} \times \frac{V}{V_{S}}$

Short circuit power factor

$W_{S}$ is the total input power on short circuit
$V_{S L}$ is the line voltage on short circuit
$I_{S L}$ is the line current on short circuit
$c o s ϕ_{S}$ is the short circuit power factor
$c o s ϕ_{S} = \frac{W_{S}}{\sqrt{3} V_{S L} I_{S L}}$ ^[12]

Leakage reactance

$Z_{01}$ is the short circuit impedance as referred to stator
$X_{01}$ is the leakage reactance per phase as referred to stator
$Z_{01} = \frac{short circuit voltage per phase}{short circuit current} = \frac{V_{S}}{I_{S}}$

$W_{c u}$ is the total copper loss
$W_{c}$ is the core loss

$W_{c u} = W_{S} - W_{c}$
$W_{c u} = 3 \times {I_{S}}^{2} R_{01}$

$R_{01} = \frac{W_{c u}}{3 {I_{S}}^{2}}$

$X_{01} = \sqrt{{Z_{01}}^{2} - R_{01}^{2}}$

References

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Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

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↑ Template:Cite web
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[1] Template:Cite web

[2] Template:Cite web

[3] One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang

[4] Template:Cite web

[5] 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

My blog: http://www.primaboinca.com/view_profile.php?userid=5889534

[6] Template:Cite web

[7] 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

My blog: http://www.primaboinca.com/view_profile.php?userid=5889534

[8] Template:Cite web

[9] One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang

[10] Template:Cite web

[11] 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

My blog: http://www.primaboinca.com/view_profile.php?userid=5889534

[12] 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

My blog: http://www.primaboinca.com/view_profile.php?userid=5889534

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+'''Blocked rotor test''' is conducted on an [[induction motor]]. It is also known as [[short circuit test]] or locked rotor test or stalled torque test.<ref>{{cite web|url =http://www.eswtesters.com/motor_testing_methods.php|title =Motor testing methods|publisher =Electronic Systems of Wisconsin, Inc.}}</ref> From this test [[short circuit current]] at [[Voltage|normal voltage]], [[power factor]] on short circuit, total [[Electrical reactance|leakage reactance]], [[Torque|starting torque]] of the motor can be found.<ref>{{cite web|url =http://iitg.vlab.co.in/?sub=61&brch=168&sim=916&cnt=1712|title =Blocked rotor test|publisher =Sakshat virtual labs}}</ref><ref>{{cite journal|last=de Swardt|first=Henk |url=http://www.mandc.co.za/pdfs/Locked_rotor_test_explained.pdf|title =The Locked rotor test explained|publisher =Marthinusen & Coutts (Pty.) Ltd}}</ref> The test is conducted at low voltage because if the applied voltage was normal voltage then the current flowing through the stator windings were high enough to over heat the winding and damage them.<ref>{{cite web|url =http://www.eswtesters.com/motor_testing_methods.php|title =Motor testing methods|publisher =Electronic Systems of Wisconsin, Inc.}}</ref> The ''blocked rotor torque test'' is not performed on a wound rotor motors because the starting torque can be varied as desired. However, ''blocked rotor current test'' is conducted on squirrel cage rotor motors.<ref>{{cite book|url =http://books.google.co.in/books?id=V1pepm-1m-cC&pg=PA263&dq=Locked+rotor+test&hl=en&sa=X&ei=_vDqT7-NMoizrAfE1uTVBQ&ved=0CFwQuwUwBw#v=onepage&q=Locked%20rotor%20test&f=false|title =Industrial Power Engineering and Applications Handbook|publisher =Newnes}}</ref>
+==Method==
+In the blocked rotor test, the [[Rotor (electric)|rotor]] is locked.<ref>{{cite web|url =http://iitg.vlab.co.in/?sub=61&brch=168&sim=916&cnt=1712|title =Blocked rotor test|publisher =Sakshat virtual labs}}</ref> A low voltage is applied on the stator terminals so that [[full load current]] flows in the stator winding. The current, voltage and power input are measured at this point. When the rotor is stationary the [[slip (motors)|slip]], <math> s = 1 </math>.<ref>{{cite book|last =B.L. Theraja|first=A.K. Theraja| title = Electrical Technology volume 2|publisher= S. Chand|edition=Twenty third revised multicolour|year=2010|page=1317|isbn=81-219-2437-5}}</ref> The test is conducted at <math> 1/4 ^{th} </math> the rated frequency as recommended by IEEE. This is because the rotor's effective resistance at low frequency may differ at high frequency.<ref>{{cite web|last =Knight|first =Dr Andy|url =http://www.ece.ualberta.ca/~knight/electrical_machines/induction/parameters/params.html|title =Electrical Machines|publisher =Department of Electrical and Computer engineering, University of Alberta}}</ref><ref>{{cite journal|last=Pitis|first=CD |https://docs.google.com/viewer?a=v&q=cache:dqMYx9A7SR8J:www.eepublishers.co.za/images/upload/femco%2520squirrel.doc+&hl=en&gl=in&pid=bl&srcid=ADGEESg5Rz7fWQUOsorcMSEdx-w1qmBvd52ATrYU2Txc0O4MlIJOxcGYmiX1l6o_Yrwg3LwlChi83gSKgv8iEgHIr7f5mN5cxiXDvpJWo3HJx_ksx1uwqnECdBs_Dib77K8JPqhUu4T2&sig=AHIEtbQMHjRqDCfrS9x7QA8klVs3r2mHEA|title =femco squirrel.doc|publisher =Femco mining motors}}</ref> The test can be repeated for different values of voltage to ensure the values obtained are consistent. As the current flowing through the stator may exceed the rated current, the test should be conducted quickly.<ref>{{cite web|url =http://www.eswtesters.com/motor_testing_methods.php|title =Motor testing methods|publisher =Electronic Systems of Wisconsin, Inc.}}</ref> By using the parameters found by this test, the motor circle diagram can be constructed.<ref>{{cite book|last =Deshpande|first =M.V.|url =http://books.google.co.in/books?id=7rwh4cw4C5gC&pg=PA254&dq=Locked+rotor+test&hl=en&sa=X&ei=_vDqT7-NMoizrAfE1uTVBQ&ved=0CEAQuwUwAg#v=onepage&q=Locked%20rotor%20test&f=false|title =Electrical Machines|publisher =PHI Learning Pvt. Ltd}}</ref>
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+==Calculations involved==
+===Short circuit current at normal voltage===
+<math> I_{S} </math> is the short circuit current at voltage <math> V_{S} </math><br>
+<math> I_{SN} </math> is the short circuit current at normal voltage <math> V </math><br>
+<math> I_{SN} = I_{S} \times \frac {V} {V_{S}}</math>
+===Short circuit power factor===
+<math> W_{S} </math> is the total input power on short circuit<br>
+<math> V_{SL} </math> is the line voltage on short circuit<br>
+<math> I_{SL} </math> is the line current on short circuit<br>
+<math> cos \phi_{S} </math> is the short circuit power factor<br>
+<math> cos \phi_{S} = \frac {W_{S}} {{\sqrt{3}} {V_{SL}} {I_{SL}}} </math><ref>{{cite book|last =Deshpande|first =M.V.|url =http://books.google.co.in/books?id=7rwh4cw4C5gC&pg=PA254&dq=Locked+rotor+test&hl=en&sa=X&ei=_vDqT7-NMoizrAfE1uTVBQ&ved=0CEAQuwUwAg#v=onepage&q=Locked%20rotor%20test&f=false|title =Electrical Machines|publisher =PHI Learning Pvt. Ltd}}</ref>
+===Leakage reactance===
+<math> Z_{01} </math> is the short circuit impedance as referred to stator<br>
+<math> X_{01} </math> is the leakage reactance per phase as referred to stator<br>
+<math> Z_{01} = \frac \text {short circuit voltage per phase} \text {short circuit current} = \frac {V_{S}} {I_{S}} </math>
+<math> W_{cu} </math> is the total copper loss<br>
+<math> W_{c} </math> is the core loss
+<math> W_{cu} = W_{S} - W_{c}</math><br>
+<math> W_{cu} = {3} \times{{I_{S}}^{2} {R_{01}}}</math>
+<math> R_{01} = \frac {W_{cu}} {3{I_{S}}^{2}}</math>
+<math> X_{01} = \sqrt {{Z_{01}}^{2} - {R_{01}^{2}}}</math>
+==See also==
+*[[Open circuit test]]
+*[[Circle diagram]]
+==References==
+{{reflist}}
+[[Category:Electrical circuits]]

Regression-kriging: Difference between revisions

Revision as of 23:05, 10 October 2013

Contents

Method

Calculations involved

Short circuit current at normal voltage

Short circuit power factor

Leakage reactance

See also

References

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Regression-kriging: Difference between revisions

Revision as of 23:05, 10 October 2013

Method

Calculations involved

Short circuit current at normal voltage

Short circuit power factor

Leakage reactance

See also

References

Navigation menu

Search